8. A drug company wants to design a pill that will dissolve when placed in water but will not dissolve when exposed to fats. Based on what you know about water and fat, describe the characteristics a pill must have to dissolve in water but not in fat. Please help! =D

Fat is hydrophobic and it repels water due to the polarity of the fat molecules. Fat will not dissolve in water but some water can dissolve in much fat. And some fat can dissolve in much water.

Explanation:

:D

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

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